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Floating slab track model

Floating slab track model

Floating slab track model


I'm trying to model a floating slab supported by steel springs in SAP (of the type shown in the attachments). The springs rest on a concrete foundation. I'm interested in the modes of vibration of the floating slab system.
My question is: how should I model the slab-spring system? Should I create the slab element at ground level and apply joint spring elements below the slab on each side? I don't know if that will account for the small distance between the floating slab and the concrete foundation (40 mm let's say).
Another question is if I should also model the concrete foundation. Would it be enough for my purposes to have the springs rest on the ground level (0 level)?

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